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libcurl would reuse a previously created connection even when some mTLS config related option had been changed that should have prohibited reuse.
libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, some TLS settings related to client certificates were left out from the configuration match checks, making them match too easily. In particular options related to the private key.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade curl | Jul 6, 2026 | Jul 3, 2026 |
| Amazon_linux_2023 | — | Upgrade curl-debugsourceUpgrade libcurl-develUpgrade libcurl-debuginfoUpgrade libcurl-minimal-debuginfoUpgrade curl-minimalUpgrade curl-debuginfoUpgrade curlUpgrade libcurlUpgrade curl-minimal-debuginfoUpgrade libcurl-minimal | Sep 30, 2026 | Jul 3, 2026 |
| Ibm Aix | — | Apply the fix or workaround for curl_advisory11 | Jul 28, 2026 | Jul 28, 2026 |
| Oracle_linux | — | Upgrade libcurl-minimalUpgrade curlUpgrade libcurl-develUpgrade libcurl | Oct 22, 2026 | Jul 3, 2026 |
| Redhat_linux | — | Upgrade libcurl-develUpgrade libcurlUpgrade curl-debuginfoUpgrade curl-debugsourceUpgrade libcurl-debuginfoUpgrade curlUpgrade libcurl-minimalNo solution existsUpgrade libcurl-minimal-debuginfo | Aug 4, 2026 | Jul 3, 2026 |
| Rocky_linux | — | Upgrade libcurl-debuginfoUpgrade curlUpgrade libcurlUpgrade libcurl-develUpgrade curl-debuginfoUpgrade curl-debugsourceUpgrade libcurl-minimal-debuginfoUpgrade libcurl-minimal | Sep 28, 2026 | Sep 22, 2026 |
| Ubuntu | — | Upgrade libcurl3-nss (Ubuntu Pro)Upgrade libcurl3-gnutls (Ubuntu Pro)Upgrade libcurl3-nssUpgrade curl (Ubuntu Pro)Upgrade libcurl3-gnutlsUpgrade libcurl3t64-gnutlsUpgrade libcurl4t64Upgrade libcurl4-nss-dev (Ubuntu Pro)Upgrade libcurl4-gnutls-devUpgrade libcurl4-openssl-dev (Ubuntu Pro)Upgrade libcurl4-gnutls-dev (Ubuntu Pro)Upgrade libcurl4-openssl-devUpgrade libcurl4 (Ubuntu Pro)Upgrade libcurl4Upgrade libcurl4-nss-devUpgrade curl | Aug 25, 2026 | Aug 24, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 10, 2026 | Jul 3, 2026 |
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